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A view of the Los Angeles city skyline as heavy smog shrouds the city in California on May 31, 2015.           AFP PHOTO/ MARK RALSTON        (Photo credit should read MARK RALSTON/AFP/Getty Images)
A view of the Los Angeles city skyline as heavy smog shrouds the city in California on May 31, 2015.           AFP PHOTO/ MARK RALSTON        (Photo credit should read MARK RALSTON/AFP/Getty Images)

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What is in our air

CNN's Jennifer Gray explains how understanding the AQI can help you avoid dangerous health risks.

What is in our air

CNN's Jennifer Gray explains how understanding the AQI can help you avoid dangerous health risks.